STRUCTURE OF TRANSMISSION AND RECEPTION UNIT IN WIRELESS CHARGING SYSTEM

• US 20130307468A1
• Filed: 10/12/2012
• Published: 11/21/2013
• Est. Priority Date: 05/21/2012
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: PARK, Jinmoo, SON, Dohyeon, LEE, Jaesung, LEE, JungJoon, SEO, Jeongkyo
• Granted Patent: US 9,325,187 B2
• Time in Patent Office: Days
• US Class Current: 320/108
• CPC Class Codes: H01F 27/36 Electric or magnetic shields or screens movable for varying inductance H01F21/10
• CPC Class Codes: H01F 27/366 made of ferromagnetic material
• CPC Class Codes: H01F 38/14 Inductive couplings for wireless supply or distribution of electric power using inductive coupling H02J50/10
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/402 the two or more transmitting or the two or more receiving devices being integrated in the same unit, e.g. power mats with several coils or antennas with several sub-antennas
• CPC Class Codes: H02J 50/70 involving the reduction of electric, magnetic or electromagnetic leakage fields
• CPC Class Codes: H02J 50/80 involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
• CPC Class Codes: H02J 50/90 involving detection or optimisation of position, e.g. alignment
• CPC Class Codes: H02J 7/00 Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
• CPC Class Codes: H02J 7/00036 Charger exchanging data with battery
• CPC Class Codes: H02J 7/00047 with provisions for charging different types of batteries
• CPC Class Codes: H04B 5/79 for data transfer in combination with power transfer

Abstract

The present disclosure provides the structure of a transmission and reception unit in a wireless charging system. To this end, according to an embodiment, there is provided a wireless power receiver configured to receive a wireless power signal from a wireless power transmitter to receive wireless power, and the wireless power receiver may include a receiving coil unit comprising a primary coil and a secondary coil receiving the wireless power signal; and a charger configured to charge power which is a sum of wireless power received by the primary coil and the secondary coil, respectively, based on the wireless power signal.

Claims

1. A wireless power receiver configured to receive a wireless power signal from a wireless power transmitter to receive wireless power, the wireless power receiver comprising:

a receiving coil unit comprising a primary coil and a secondary coil for receiving the wireless power signal; and

a charger configured to charge power which is a sum of wireless power received by each of the primary coil and the secondary coil, based on the wireless power signal.

2. The wireless power receiver of claim 1, wherein the primary coil is a coil capable of receiving the wireless power signal for providing first rated power, and

the secondary coil is a coil capable of receiving the wireless power signal for providing second rated power.

3. The wireless power receiver of claim 2, wherein each of the first rated power and the second rated power is 5 W.

4. The wireless power receiver of claim 1, wherein the primary coil includes first and second terminals, and is wound in the form of a bifilar winding, and

wherein the secondary coil includes third and fourth terminals and is wound in the form of a bifilar winding.

5. The wireless power receiver of claim 4, wherein the primary coil and the secondary coil are arranged adjacent to each other such that their directions for receiving the wireless power signal are identical.

6. The wireless power receiver of claim 1, wherein the primary coil is formed such that a first wire connecting between the first terminal and the second terminal is wound, and

the secondary coil is formed such that a second wire connecting between the third terminal and the fourth terminal is wound, and

the first wire and the second wire are wound together in the form of a bifilar winding.

7. The wireless power receiver of claim 1, further comprising:

a rectifier unit configured to convert an alternating current signal generated by the primary coil and the secondary coil into a direct current signal based on the wireless power signal,

wherein the charger charges the power which is the sum of wireless power received by the primary coil and the secondary coil, based on the direct current signal.

8. The wireless power receiver of claim 7, wherein the rectifier unit comprises a first rectifier circuit configured to convert a first alternating current signal generated by the primary coil into a first direct current signal, and a second rectifier circuit configured to convert a second alternating current signal generated by the secondary coil into a second direct current signal, and

the charger charges the power which is the sum of wireless power received by the primary coil and the secondary coil, based on the first direct current signal and the second direct current signal.

9. A wireless power transmitter configured to transfer wireless power to a wireless power receiver, the wireless power transmitter comprising:

a transmitting (Tx) coil assembly including;

a transmitting coil configured to generate a wireless power signal and to transmit the wireless power signal to a receiving coil of the wireless power receiver; and

a shielding portion configured to shield a transmission of the wireless power signal in a specific direction, and provided with a recessed structure for accommodating the transmitting coil,

wherein the transmitting coil is aligned with the receiving coil, without a magnet for providing alignment aid or Align Assistance to align with the receiving coil of the wireless power receiver.

10. The wireless power transmitter of claim 9, wherein the specific direction is a direction opposite to a direction in which the wireless power signal is transmitted to the receiving coil.

11. The wireless power transmitter of claim 9, further comprising:

an auxiliary means for providing the alignment aid or Align Assistance.

12. The wireless power transmitter of claim 11, wherein the auxiliary means is at least one of:

a display module for displaying alignment information which is used to align with the receiving coil,

an audio output module, and

a haptic module.

13. The wireless power transmitter of claim 11, wherein the transmitting (Tx) coil assembly further comprises an interface surface facing the receiving coil.

14. The wireless power transmitter of claim 13, wherein the auxiliary means is a marker or lighting means provided on the interface surface for providing the alignment aid to align with the receiving coil.

15. A wireless power transmitter configured to transfer wireless power to a wireless power receiver, the wireless power transmitter comprising:

a transmitting (Tx) coil assembly including;

a transmitting coil configured to generate a wireless power signal and to transmit the wireless power signal to a receiving coil of the wireless power receiver; and

a shielding portion configured to shield a transmission of the wireless power signal in a specific direction, and provided with a recessed structure for accommodating the transmitting coil,

wherein the transmitting coil is aligned with the receiving coil, regardless of a magnet for providing alignment aid or Align Assistance to align with the receiving coil of the wireless power receiver.

16. The wireless power transmitter of claim 15, further comprising:

an auxiliary means for providing the alignment aid or Align Assistance.

17. The wireless power transmitter of claim 16, wherein the auxiliary means is at least one of:

a display module for displaying alignment information which is used to align with the receiving coil,

an audio output module, and

a haptic module.

18. The wireless power transmitter of claim 16, wherein the transmitting (Tx) coil assembly further comprises an interface surface facing the receiving coil.

19. The wireless power transmitter of claim 18, wherein the auxiliary means is a marker or lighting means provided on the interface surface for providing the alignment aid to align with the receiving coil.